13818944243 has 4 divisors (see below), whose sum is σ = 14881939968. Its totient is φ = 12755948520.

The previous prime is 13818944239. The next prime is 13818944263. The reversal of 13818944243 is 34244981831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34244981831 = 40471 ⋅846161.

It is a cyclic number.

It is not a de Polignac number, because 13818944243 - 2² = 13818944239 is a prime.

It is a super-2 number, since 2×13818944243² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13818944263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531497843 + ... + 531497868.

It is an arithmetic number, because the mean of its divisors is an integer number (3720484992).

Almost surely, 2^13818944243 is an apocalyptic number.

13818944243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

13818944243 is a deficient number, since it is larger than the sum of its proper divisors (1062995725).

13818944243 is a wasteful number, since it uses less digits than its factorization.

13818944243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062995724.

The product of its digits is 663552, while the sum is 47.

The spelling of 13818944243 in words is "thirteen billion, eight hundred eighteen million, nine hundred forty-four thousand, two hundred forty-three".